Download White Rodgers 1F80-0224 Specifications

1F80-224
Programmable Electronic Digital Thermostat
INSTALLATION AND
OPERATION INSTRUCTIONS
Operator: Save these instructions for future use!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY
BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.
DESCRIPTION
Your new White-Rodgers 24-Hour Digital Thermostat uses the
technology of a solid-state microcomputer to provide precise
time/temperature control. This thermostat offers you the flexibility to design heating and cooling programs that fit your needs.
Features:
• Simultaneous heat and cool program storage
• Preprogrammed temperature control
• Four separate time/temperature settings
• LCD continuously displays setpoint, and alternately
displays time and room temperature
•
•
•
•
•
•
•
Temperature override until next program period
Manual program override (HOLD temperature)
Temporary HOLD
°F/°C convertibility
Temperature range 45° to 90°F
RC, RH, W, Y, G , O and B terminals
B and O terminals for single stage heat pumps (no auxiliary
heat) or damper operation
• Program storage in case of power loss
• 2 “AA” Energizer® alkaline batteries included
PRECAUTIONS
This thermostat is intended for use with a low voltage system; do
not use this thermostat with a line voltage system. If in doubt
about whether your wiring is millivolt, line, or low voltage, have
it inspected by a qualified heating and air conditioning contractor
or electrician.
Do not exceed the specification ratings.
All wiring must conform to local and national electrical codes and
ordinances.
This control is a precision instrument, and should be handled
carefully. Rough handling or distorting components could cause
the control to malfunction.
! CAUTION
▲
! WARNING
▲
Do not use on circuits exceeding specified voltage.
Higher voltage will damage control and could cause
shock or fire hazard.
Do not short out terminals on gas valve or primary
control to test. Short or incorrect wiring will damage
thermostat and could cause personal injury and/or
property damage.
Thermostat installation and all components of the
system shall conform to Class II circuits per the NEC
code.
To prevent electrical shock and/or equipment damage,
disconnect electric power to system at main fuse or
circuit breaker box until installation is complete.
SPECIFICATIONS
ELECTRICAL DATA
APPLICATIONS
Electrical Rating:
8 to 30 VAC 50/60 Hz. or D.C.
0.05 to 1.0 Amps (Load per terminal)
1.5 Amps Maximum Total Load (All terminals combined)
THERMAL DATA
Setpoint Temperature Range:
45°F to 90°F (7°C to 32°C)
Operating Ambient Temperature Range:
32°F to 105°F
Operating Humidity Range:
0 to 90% RH (non-condensing)
Shipping Temperature Range:
-4°F to 150°F
For use with:
• Standard heat/cool or heat only systems
• Electric heat systems
• Gas or oil fired systems
• Gas systems with intermittent ignition devices (I.I.D.)
and/or vent dampers
• Hydronic (hot water or steam) systems
• Single-stage heat pump systems (no auxiliary heat)
• Millivolt systems
DO NOT USE WITH:
• Multi-stage systems
• Systems exceeding 30 VAC and 1.5 amps
• 3-wire zoned hydronic heating systems
WHITE-RODGERS
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
www.white-rodgers.com
Printed in U.S.A.
PART NO. 37-6350C
Replaces 37-6350B
0326
INSTALLATION
REMOVE OLD THERMOSTAT
Screw anchors
1. Shut off electricity at the main fuse box until installation is
complete. Ensure that electrical power is disconnected.
2. Remove the front cover of the old thermostat. With wires
still attached, remove wall plate from the wall. If the old
thermostat has a wall mounting plate, remove the thermostat and the wall mounting plate as an assembly.
3. Identify each wire attached to the old thermostat using
the labels enclosed with the new thermostat.
4. Disconnect the wires from old thermostat one at a time. DO
NOT LET WIRES FALL BACK INTO THE WALL.
5. Install new thermostat using the following procedures.
Mounting
Electric/Gas
holes
switch
ATTENTION!
This product does not contain mercury. However, this product
may replace a unit which contains mercury.
Mounting
holes
Do not open mercury cells. If a cell becomes damaged, do not
touch any spilled mercury. Wearing nonabsorbent gloves, take
up the spilled mercury with sand or other absorbent material and
place into a container which can be sealed. If a cell becomes
damaged, the unit should be discarded.
Figure 1. Thermostat Base
Mercury must not be discarded in household trash. When the
unit this product is replacing is to be discarded, place in a
suitable container and return to White-Rodgers at 2895 Harrison
Street, Batesville, AR 72501-2117 for proper disposal.
6. Push excess wire into wall and plug hole with a fire-resistant
material (such as fiberglass insulation) to prevent drafts
from affecting thermostat operation.
ELECTRIC HEAT OR SINGLE-STAGE
HEAT PUMP SYSTEMS
2 "AA" alkaline batteries are included in the thermostat at the
factory with a battery tag to prevent power drainage. You must
remove the battery tag to engage the batteries
batteries.
BATTERY LOCATION
This thermostat is configured from the factory to operate a heat/
cool, fossil fuel (gas, oil, etc.), forced air system. It is configured
correctly for any system that DOES NOT require the thermostat
to energize the fan on a call for heat. If your system is an electric
heat or heat-pump system that REQUIRES the thermostat to
turn on the fan on a call for heat, locate the GAS/ELECTRIC
switch on the back of the thermostat (see fig. 1) and switch it to
the ELECTRIC position. This will allow the thermostat to energize the fan immediately on a call for heat. If you are unsure if
the heating/cooling system requires the thermostat to control
the fan, contact a qualified heating and air conditioning service
person.
If BATT is displayed, the batteries are low and should be
replaced with fresh "AA" Energizer® alkaline batteries. To
replace batteries, install the batteries along the top of the base
(see Fig. 1). The batteries must be installed with the positive (+)
end to the left.
HYDRONIC (HOT WATER OR STEAM)
HEATING SYSTEMS
This thermostat is set to operate properly with a forced-air
heating system. If you have a hydronic heating system (a
system that heats with hot water or steam), you must set the
thermostat to operate properly with your system. Change the
second option in the configuration menu to SL (see CONFIGURATION MENU, page 4).
ATTACH THERMOSTAT BASE TO WALL
1. Remove the packing material from the thermostat. Gently
pull the cover straight off the base. Forcing or prying on the
thermostat will cause damage to the unit. If necessary, move
the electric heat switch (see ELECTRIC HEAT SYSTEMS
SYSTEMS,
above).
2. Connect wires beneath terminal screws on base using
appropriate wiring schematic (see figs. 2 through 7).
3. Place base over hole in wall and mark mounting hole
locations on wall using base as a template.
4. Move base out of the way. Drill mounting holes.
5. Fasten base loosely to wall, as shown in fig. 1, using two
mounting screws. Place a level against bottom of base,
adjust until level, and then tighten screws. (Leveling is for
appearance only and will not affect thermostat operation.) If
you are using existing mounting holes, or if holes drilled are
too large and do not allow you to tighten base snugly, use
plastic screw anchors to secure subbase.
CHECK THERMOSTAT OPERATION
If at any time during testing your system does not operate
properly, contact a qualified service person.
Turn on power to the system.
Fan Operation
If your system does not have a G terminal connection, skip to
System.
Heating System
1. Move fan to ON position. The blower should begin to
operate.
2. Move fan switch to AUTO position. The blower should
stop immediately.
2
JUMPER
WIRE
THERMOSTAT
B
Y
O
G
W
RC
RH
THERMOSTAT
B
Y
O
G
W
RC
SYSTEM
RH
SYSTEM
Fan
Relay
Heating
System
Cooling
System
Fan
Relay
Hot
Heating
System
24 VAC
120 VAC
Neutral
Hot
24 VAC
NOTE
HEATING
TRANSFORMER
120 VAC
Neutral
For 2-wire Heat only,
attach to RH and W
Hot
TRANSFORMER
24 VAC
Figure 2. Typical wiring diagram for
heat only, 3-wire, single transformer systems
120 VAC
Neutral
COOLING TRANSFORMER
Figure 5. Typical wiring diagram for
heat/cool, 5-wire, two-transformer systems
JUMPER
WIRE
THERMOSTAT
B
Y
O
G
W
RC
RH
SYSTEM
Cooling
System
JUMPER
WIRE
JUMPER
WIRE
THERMOSTAT
Fan
Relay
B
Hot
24 VAC
Y
O
G
W
RC
RH
SYSTEM
120 VAC
Reversing Compressor Fan
Valve*
Contactor Relay
Neutral
TRANSFORMER
Hot
24 VAC
Figure 3. Typical wiring diagram for
cool only, 3-wire, single transformer systems
* Reversing valve is energized when the
system switch is in the COOL position
120 VAC
Neutral
TRANSFORMER
Figure 6. Typical wiring diagram for heat pump
with reversing valve energized in COOL
NOTE
RED jumper wire (provided with thermostat) must be
connected between thermostat RH and RC terminals
for proper thermostat operation with this system.
JUMPER
WIRE
JUMPER
WIRE
THERMOSTAT
B
O
Y
G
W
RC
JUMPER
WIRE
RH
THERMOSTAT
SYSTEM
B
O
Y
G
W
RC
RH
SYSTEM
Cooling
System
Fan
Relay
Heating
System
Reversing Compressor Fan
Valve*
Contactor Relay
Hot
24 VAC
120 VAC
Hot
24 VAC
* Reversing valve is energized when the
system switch is in the HEAT position
Neutral
TRANSFORMER
120 VAC
Neutral
TRANSFORMER
Figure 7. Typical wiring diagram for heat pump
with reversing valve energized in HEAT
Figure 4. Typical wiring diagram for
heat/cool, 4-wire, single transformer systems
Cooling System
! CAUTION
▲
Heating System
To prevent compressor and/or property damage, if the
outdoor temperature is below 50°F, DO NOT operate
the cooling system.
1. Move SYSTEM switch to HEAT position. If the heating
system has a standing pilot, be sure to light it.
2. Press
to adjust thermostat setting above room temperature. The heating system should begin to operate.
1. Move SYSTEM switch to COOL position.
to adjust temperature setting below room tem3. Press
perature. The heating system should stop operating.
2. Press
to adjust thermostat setting below room temperature. The blower should come on immediately on high
speed, followed by cold air circulation
3. Press
to adjust temperature setting above room temperature. The cooling system should stop operating.
3
OPERATION
Before you begin programming your thermostat, you should be
familiar with its features and with the display and the location
and operation of the thermostat buttons. Your thermostat consists of two parts: the thermostat cover and the base
base. To
remove the cover, pull it straight out from the base. To replace
the cover, line up the cover with the base and press until the
cover snaps onto the base.
The Thermostat Buttons and Switches
1 Raises temperature setting.
2 Lowers temperature setting.
3 TIME button.
4 PRGM (program) button.
5 RUN (run program) button.
6 HOLD temperature button.
ON
7 FAN switch (ON
ON, AUTO
AUTO).
COOL
COOL, OFF
OFF, HEAT
HEAT).
8 SYSTEM switch (COOL
1) Select Temporary Hold Time - The thermostat can hold
any temperature you set it to for the amount of time you
select on this option. Your choices are 0:00 to 8:00 hours in
15 minute increments. 0:00 disables the function
Example:
1. You have selected 3:00 hours for the Temporary Hold
time period.
2. With the thermostat set to Heat or Cool, press HOLD for
approximately five seconds until HOLD time (3:00
indicating 3 hours) appears as a setting reminder.
3. After releasing the button, HOLD on the display will
blink.
or
to set the temperature to your prefer4. Use
ence. The thermostat will maintain this temperature
setting for 3 hours with HOLD blinking to remind you it is
in Temporary Hold. After 3 hours the thermostat will go
back to the program temperature and HOLD will no
longer blink or display.
2) Select FA or SL (Fast or Slow) Heating Cycle Rate - The
FA setting is frequently used for gas, oil or electric heat. The
SL setting produces a longer heating cycle which is normally for hot water or steam (hydronic) systems. Both
settings produce very accurate temperature control and
can be set to your personal preference. FA cycles the
system just under 1°F and the SL setting cycles at approximately 1.5°F.
3) Select backlit display - The display backlight improves
display contrast in low lighting conditions. Selecting backlight ON will keep the light on for a short period of time after
any key is pressed. Selecting OFF will keep the light off.
4) Select Compressor Lockout LOC OFF or ON - Selecting
LOC ON will cause the thermostat to wait 5 minutes before
turning on the compressor if the heating and cooling system loses power. It will also wait 5 minutes minimum
between cooling cycles. This is intended to help protect the
compressor from short cycling. Some newer compressors
already have a time delay built in and do not require this
feature. Your compressor manufacturer can tell you if the
feature is already present in their system. When the
compressor time delay occurs it will flash the (snowflake
icon) for about five minutes then turn on the compressor.
The Display
9 Flame icon ( ) is displayed when the SYSTEM switch is in
the HEAT position. Snowflake icon ( )is displayed (nonflashing) when the SYSTEM switch is in the COOL position.
Snowflake is displayed (flashing) if the thermostat is in
lockout mode to prevent the compressor from cycling too
quickly.
10 Displays BATT when the 2 "AA" batteries are low and
should be replaced. Only BATT and LO in the minutes field
are displayed when batteries are low with no system
power.
11 Alternately displays current time and temperature. Displays LO in the minutes field when batteries are low.
12 The word HOLD is displayed when the thermostat is in the
HOLD mode. HOLD is displayed flashing when the thermostat is in a temporary HOLD Mode.
13 Displays currently programmed set temperature (this is
blank when SYSTEM switch is in the OFF position).
CONFIGURATION MENU
The configuration menu allows you to set certain thermostat
operating characteristics to your system or personal requirements.
Press RUN to make sure the thermostat is in the run program
mode, then press PRGM and RUN at the same time to enter the
configuration menu. The display will show the first item in the
configuration menu.
The configuration menu table summarizes the configuration
options. An explanation of each option follows.
Press HOLD to change to the next menu item or press TIME to
go backwards to the previous item in the menu. To exit the menu
and return to the program operation, press RUN. If no keys are
pressed within fifteen minutes, the thermostat will revert to
normal operation.
4
Configuration Menu
Step
Press Button(s)
1
PRGM
and RUN
2
HOLD*
3
HOLD*
4
HOLD*
5
Displayed (Factory Default)
HOLD
(0:00)
Press
or
to select:
0 to 8 hrs (in
15 minute increments)
SL
(FA)
d-L
(ON)
COMMENTS
Select temporary Hold time
Select FA or SL (Fast or Slow) heating cycle rate
OFF
Select display backlight OFF or ON
LOC
(OFF)
ON
Select compressor lockout OFF or ON
HOLD*
0 HI
(0)
4 LO to
4 HI
6
HOLD*
(F)
C
7
RUN
Select temperature display adjustment higher or lower
Select temperature display to F or C
Returns to normal operation
* Press HOLD to advance to next item or TIME to move backwards to previous item
• CONFIGURATION MENU — Allows you to customize
certain thermostat options.
5 Select Temperature Display Adjustment 4 LO to 4 HI Allows you to adjust the room temperature display 4° higher
or lower. Your thermostat was accurately calibrated at the
factory but you have the option to change the display
temperature to match your previous thermostat.
6) Select F° or C° Readout - Changes the display readout to
Centigrade or Fahrenheit as required.
PROGRAMMING YOUR THERMOSTAT
This section will help you plan your thermostat’s program to
meet your needs. For maximum comfort and efficiency, keep
the following guidelines in mind when planning your program.
• When heating (cooling) your building, program the
temperatures to be cooler (warmer) when the building is
vacant or during periods of low activity.
• During early morning hours, the need for cooling is
usually minimal.
OPERATING FEATURES
Now that you are familiar with the thermostat buttons and
display, read the following information to learn about the many
features of the thermostat.
• SIMULTANEOUS HEATING/COOLING PROGRAM
STORAGE — When programming, you can enter both
your heating and cooling programs at the same time. There
is no need to reprogram the thermostat at the beginning of
each season.
or
until the
• TEMPERATURE OVERRIDE — Press
display shows the temperature you want. The thermostat
will override current programming and keep the room
temperature at the selected temperature until the next
program period begins. Then the thermostat will automatically revert to the program.
• HOLD TEMPERATURE — The thermostat can hold any
temperature within its range for an indefinite period without
reverting to the programmed temperature. Momentarily
press HOLD button. HOLD will be displayed. Then choose
or
. The
the desired temperature by pressing
thermostat will hold the room temperature at the selected
setting until you press RUN button to start program operation again.
Planning Your Program
Look at the factory preprogrammed times and temperatures
shown in the sample schedule. If this program will suit your
needs, simply press the RUN button to begin running the factory
preset program.
If you want to change the preprogrammed times and temperatures, follow these steps.
Determine the time periods and temperatures for your program.
You must program four time periods. However, you may use the
same heating and cooling temperatures for consecutive time
periods.
Use the following table to plan your program time periods and
the temperatures you want during each period. Fill in the
complete table to have a record of your programs.
SAMPLE
Heating/Cooling Schedule Plan (Factory Program)
Heating/Cooling Schedule Plan
Start
Time
Temperature
1ST HEAT
6:00 AM
70˚F
1ST HEAT
2ND HEAT
8:00 AM
62˚F
2ND HEAT
3RD HEAT
5:00 PM
70˚F
3RD HEAT
4TH HEAT
10:00 PM
62˚F
4TH HEAT
1ST COOL
6:00 AM
78˚F
1ST COOL
2ND COOL
8:00 AM
85˚F
2ND COOL
3RD COOL
5:00 PM
78˚F
3RD COOL
4TH COOL
10:00 PM
82˚F
4TH COOL
Period
Period
5
Start
Time
Temperature
Entering Your Program
Enter Cooling Program
! CAUTION
▲
Follow these steps to enter the heating and cooling programs
you have selected.
If the outside temperature is below 50°F, disconnect
power to the cooling system before programming.
Energizing the air conditioner compressor during
cold weather may cause personal injury or property
damage.
Set Current Time
1. Press TIME button once. The display will show the hour only.
EXAMPLE:
PM
1. Move SYSTEM switch to COOL position.
2. Follow the procedure for entering your cooling program,
using your selected cooling times and temperatures.
2. Press and hold either
or
until you reach the correct
AM begins at midnight; PM
hour and AM/PM designation (AM
begins at noon).
3. Press TIME once. The display window will show the minutes
only.
CHECK YOUR PROGRAMMING
Follow these steps to check your thermostat programming one
final time before beginning thermostat operation.
EXAMPLE:
4. Press and hold either
minutes.
or
1. Move SYSTEM switch to HEAT position.
2. Press PRGM to view the 1st heating period time and
temperature. Each time you press PRGM, the next heating
period time and temperature will be displayed in sequence
(you may change any time or temperature during this procedure).
3. Press RUN.
4. Move SYSTEM switch to COOL position.
5. Repeat step 2 to check cooling program.
6. Move SYSTEM switch to HEAT or COOL and press RUN to
begin program operation.
until you reach the correct
Enter Heating Program
1. Move the SYSTEM switch to HEAT
HEAT.
2. Press PRGM once. Displayed are the currently programmed
start time for the 1st heating period and the currently
programmed temperature (flashing).
EXAMPLE:
AM
YOUR THERMOSTAT IS NOW COMPLETELY PROGRAMMED AND
READY TO PROVIDE MAXIMUM COMFORT AND EFFICIENCY!
This display window shows that for the 1st weekday period,
the start time is 6:00 AM, and 70° is the programmed
temperature (this example reflects factory preprogramming).
or
to change the displayed temperature to
3. Press
your selected temperature for the 1st heating program
period.
4. Press TIME once (the programmed time will flash). Press
or
until your selected time appears. The time will
change in 15 minute increments. When your selected time
is displayed, press TIME again to return to the change
temperature mode.
5. Press PRGM once. The currently programmed start time
and setpoint temperature for the 2nd heating program
period will appear.
6. Repeat steps 3 and 4 to select the start time and heating
temperature for the 2nd heating program period.
7. Repeat steps 3 through 5 for the 2nd, 3rd and 4th heating
program periods. Programming is now complete.
8. When you have completed entering your program, press
RUN.
TROUBLESHOOTING
Reset Operation
If a voltage spike or static discharge blanks out the display or
causes erratic thermostat operation you can reset the thermo,
and TIME at the same time. This also
stat by pressing
resets the factory defaults to the configuration menu and
program. If the thermostat has power, has been reset and still
does not function correctly contact your heating/cooling service person or place of purchase.
Batteries
For optimum performance, we recommend replacing batteries
once a year with fresh "AA" Energizer® alkaline batteries.
For Troubleshooting information, see next page
6
TROUBLESHOOTING
Symptom
Possib
le Cause
ossible
Corrective Action
No Heat/No Cool/No Fan
(common problems)
1. Blown fuse or tripped circuit breaker.
2. Furnace power switch to OFF.
3. Furnace blower compartment door or
panel loose or not properly installed.
1. Pilot light not lit.
2. System Switch not set to Heat.
Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage
safety interlock or door switch.
Re-light pilot.
Set System Switch to Heat and raise setpoint
above room temperature.
Verify thermostat and system wires are securely
attached.
Many furnaces have safety devices that shut the
system down when a lock-out condition occurs.
If the heat works intermittently contact the furnace
manufacturer or local service person for assistance.
Diagnostic: Set System Switch to Heat and raise
the setpoint above room temperature. Within a few
seconds the thermostat should make a soft click
sound. This sound usually indicates the thermostat
is operating properly. If the thermostat does not
click, try the reset operation listed above. If the
thermostat does not click after being reset contact
your heating and cooling service person or place
of purchase for a replacement. If the thermostat
clicks, contact the furnace manufacturer or a
service person to verify the heating system is
operating correctly.
Set System Switch to Cool and lower setpoint
below room temperature.
Verify thermostat and system wires are securely
attached.
Same procedure as diagnostic for No Heat
condition except set the thermostat to Cool and
lower the setpoint below the room temperature.
There may be up to a five minute delay before
the thermostat clicks in Cooling if the compressor
lock-out option is selected in the configuration
menu (Item 6).
Check each wire connection to verify they are
not shorted or touching together. No bare wire
should stick out from under terminal screws.
Try resetting the thermostat. If the condition
persists the manufacturer of your system
or service person can instruct you on how
to test the Heat/Cool system for correct
operation. If the system operates correctly,
replace the thermostat.
Item 2 in the Configuration Menu is the adjustment
that controls the cycle rate. If an acceptable cycle
rate is not achieved using the FA (Fast) or SL
(Slow) adjustment contact a local service person for
additional suggestions.
The cycle rate for cooling is fixed and can not be
adjusted. Contact a local service person for
suggestions.
The thermometer can be adjusted +/- 4 degrees as
listed in item 7 of the Configuration Menu. No other
adjustment is possible.
The thermostat will maintain its program in memory
even with no power/no batteries but the clock time
will be incorrect when power is restored. See No
Heat/No Cool/No Fan (common problems) above
for items to check in the system.
See Configuration Menu (Item 4).
Check current clock and program settings including
the AM or PM designations for each time period.
If a voltage spike or static discharge occurs use the
Reset Operation listed above.
Replace batteries and check heat/cool system for
proper operation. If a voltage spike or static discharge
occurs use the Reset Operation listed above.
No Heat
3. Loose connection to thermostat or system.
4. Furnace Lock-Out Condition. Heat may also
be intermittent.
5. Heating System requires service or
thermostat requires replacement.
No Cool
1. System Switch not set to Cool.
2. Loose connection to thermostat or system.
3. Cooling System requires service or thermostat
requires replacement.
Heat, Cool or Fan Runs Constantly.
1.
2.
3.
4.
Possible short in wiring.
Possible short in thermostat.
Possible short in Heat/Cool/Fan system.
Fan Switch set to Fan On.
Furnace Cycles Too Fast or Too Slow
(narrow or wide temperature swing)
1. The location of the thermostat and/or the size
of the Heating System may be influencing the
cycle rate.
Cooling Cycles Too Fast or Too Slow
(narrow or wide temperature swing)
Thermostat Setting and Thermometer
Disagree
1. The location of the thermostat and/or the size
of the Cooling System may be influencing the
cycle rate.
1. Thermostat thermometer setting requires
adjustment.
Clock Loses or Gains Time
1. Loss of power to thermostat and low batteries.
Heat or Cool Starts Early
Thermostat Does Not Follow Program
1.
1.
2.
3.
Blank Display and/or Keypad Not
Responding
1. Loss of power and dead batteries.
2. Voltage Spike or Static Discharge.
EMR activated
AM or PM set incorrectly in program.
AM or PM set incorrectly on the clock.
Voltage spike or static discharge.
7
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